Dynatek DS3-1 for 77-78 Suzuki GS550/750
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That is the secondary ignition system used on both the GP and the Hummel VWs. On those engines the Dyna S is driven off of the distributor. Maybe just use the pickups on an AeroVee. The AeroVee solution is superior. The Dyna S distributor driven solution uses two magnets in the magnet wheel. The geometry is small enough that there is noticeable jitter in the timing, on the order of two or three degrees.
This is what Sonex sent last winter when I decided to update my secondaries. I installed them and they work like a charm.
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That’s good news!! I assume those don’t shut down the secondary ignition, with no engine rotation, like the Sonex modules have been reported to do.?.?
Wes
Here is a pic of the Dyna S as applied to a distributor driven solution. Two pickups 90 Deg apart and two magnets 180 Deg. apart turning at 1/2 crank speed. A bit of a mind bender, but correct. With the magnet wheel so small it must be hard to get the magnets exactly 180 Deg apart, magnet strength the same, etc. Like I said, there is considerable jitter in the secondary ignition.
I haven’t noticed any issues with my secondaries running in an unexpected way.
That’s an interesting setup, is it provided from Hummel as a kit or is it a unique fabrication?
That’s the ignition on the GP engine I’ve been running at home. I didn’t build that engine. I have the identical setup on the Hummel I bought from Scott Casler.
You wouldn’t notice it. The easy way to tell is to turn on your secondary ignition without the engine running and either look at the current draw or feel the coils and see if they are getting hot just sitting there (with the magnets not aligned with the triggers).
Wes
How has the Hummel 2400 been for you? You know if it would bolt up to an Aerovee mount?
I’ve been trying to keep my engine options list up to date if my AeroVee needs a change.
Not quite. I had to have some bushings made. Too long ago to remember details. The engine vibration rubbers are much better than the AeroVee rubbers but custom bushings are needed to bolt it on to a Sonex mount.
The engine has been overall very good. The standard induction system uses a Zenith Carb. I’m really not happy with that. No cockpit mixture control and, like the AeroInjector, poor fuel distribution. In cruise I have 150 Deg. F EGT spread.
BTW, I believe the poor fuel distribution is a result of the intake manifold design, not a problem with the carbs.
Wes
Yes, there was a Finnish guy who had a Sonex A in Hawaii and he did a bunch of experiments on the manifold and fueling. He made a custom manifold and got EGTs and mixtures really close across all 4 cylinders of his Aerovee.
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From memory, he did not. EFI can do wonders.
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That is very interesting. I don’t understand all of it. Like why is #1 (left rear?) the richest. Both of my rear cylinders run lean. In any event, I’ll read it again and see what I can see. Is this a standard manifold?
From Patrik’s project:
Wes
Nope!
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BTW, I did play, just a bit, with LOP on a tuned engine. It didn’t take much additional trim to zero the GAMI spread after tuning for matched EGTs.
Wes
I wish I’d seen this before I fired the Parts Cannon.
Not all Dynatek crank triggers will work. I bought a NIB DCT2-1 for Kawasaki motors from an eBay seller, but it’s designed to use with their Dyna 4000 ignition controllers, and WILL NOT fire coils directly, according to the directions.
I also bought a Chinesium DS2-1 clone, also for Kawasakis, but judging from the REAL Dynatek documentation for the DS2-1, (which look almost identical to the directions for the Suzuki unit mdickler1 identified) it looks like this MIGHT directly file the coils.
The difference in quality is clear. The Dynatek comes with a nice anodized plate that mounts to the mechanical ignition advance mechanism. The Chinesium has a roughly stamped steel plate. Same with the trigger caps; the cheaper one has a big burr on the ID.
I think I’m going to go ahead and put the Chinesium triggers on. If they don’t work, I’m out less than $40 on eBay. The rest of y’all should NOT do this - buy the real deal from Dynatek.
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mdickler1 can you explicate how you wired up these pickups? The old Aerovee pickups had 3 leads per pickup, and I think 5 at the ends of the harness. The Dynatek pickups, only two at each of the pickups, and only 3 at the end of harness. Do the Dynateks rely on the case for a ground?
